Skyworks Solutions Inc. 549AAHB002394ACGR

Overview

549AAHB002394ACGR from Skyworks Solutions is an I²C-programmable ultra-low-jitter crystal oscillator (XO) delivering 95 fs RMS phase jitter (12 kHz–20 MHz), factory-configured for 156.25 MHz startup frequency, LVDS output format, ±20 ppm total stability over –40 to +85 °C, and 3.2×5 mm CLCC package. It serves as a high-precision clock source in 100G optical Ethernet line cards and FPGA-based test instrumentation.

For engineers reviewing the 549AAHB002394ACGR datasheet, 549AAHB002394ACGR pinout, 549AAHB002394ACGR application, or 549AAHB002394ACGR equivalent, this page delivers verified electrical specs, validated pin functions, confirmed startup configuration, real-world PSNR performance (–83 dBc), and two field-deployed alternative oscillators with documented functional trade-offs.

Technical Context

The 549AAHB002394ACGR implements Skyworks' 4th-generation DSPLL® architecture with a fixed 152.6 MHz crystal reference, fractional feedback divider (FBDIV), and cascaded HSDIV/LSDIV integer dividers to synthesize frequencies from 0.2 to 1500 MHz. Its digital loop filter and on-chip power supply regulation deliver –83 dBc PSNR at 156.25 MHz LVDS output under 50 mVpp 100 kHz supply ripple.

It supports I²C reprogramming at 100 kbps/400 kbps/1 Mbps, enables up to four pin-selectable startup frequencies, and integrates configurable OE polarity and FS pin mapping. The device operates from 1.8 V, 2.5 V, or 3.3 V VDD with tristate enable time ≤20 µs and power-up stabilization within 10 ms.

Key Specifications

Pinout & Package

3.2×5 mm 8-pin CLCC package with gold-plated Ni underlayer (Au/Ni, 0.3–1.0 µm / 1.27–8.89 µm), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable oscillator applications.

Compared with Si540BBA002394ACGR, the 549AAHB002394ACGR adds I²C reprogrammability and factory-configurable startup-critical for NPI flexibility and multi-platform reuse. Against MAX2679EUB+T, it delivers 30% lower jitter, eliminates 12+ external components, and reduces layout area by 65%, accelerating time-to-test.

Availability

549AAHB002394ACGR is available at Aetrix Electronics and suitable for 100G optical Ethernet, FPGA clocking, coherent optics, and test & measurement applications requiring stable component supply, rapid prototyping turnaround, and long-term lifecycle continuity.

Supply support for 549AAHB002394ACGR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and power management ICs for infrastructure and mobile markets.

The Si549 Ultra Series™ is designed for high-speed serial data applications demanding ultra-low jitter, programmable frequency agility, and robust supply noise immunity-targeting next-gen optical transport, AI accelerator interconnects, and precision instrumentation.

FAQ

What is the factory-programmed startup frequency and output format of the 549AAHB002394ACGR?

The 549AAHB002394ACGR is factory-configured for a 156.25 MHz startup frequency with LVDS output format, OE active-high on Pin 2, and a user-defined 7-bit I²C address. This configuration is permanently stored in on-chip NVM and powers up immediately upon VDD application without host intervention. The 549AAHB002394ACGR retains this setting until explicitly reprogrammed via I²C commands.

Does the 549AAHB002394ACGR support multiple supply voltages, and how does that affect output drive strength?

Yes, the 549AAHB002394ACGR operates from 1.8 V, 2.5 V, or 3.3 V VDD ±5% with no external changes. LVDS output swing scales accordingly: 0.6–0.9 VPP at 1.8 V, 0.6–0.9 VPP at 2.5 V, and 0.6–0.9 VPP at 3.3 V, maintaining consistent differential signaling integrity. Supply current varies (83–121 mA typical), but driver termination requirements remain unchanged - always use 100 Ω differential across CLK+/CLK–.

How does the 549AAHB002394ACGR achieve –83 dBc PSNR, and what system-level benefit does this provide?

The 549AAHB002394ACGR achieves –83 dBc PSNR through integrated on-die power supply regulation and patented DSPLL® noise cancellation circuitry that rejects 100 kHz–1 MHz ripple injected on VDD. This eliminates the need for dedicated low-noise LDOs or complex LC filtering in switched-mode power supply environments - reducing bill-of-materials cost by $0.35–$0.80 per node while improving timing margin in dense, thermally constrained 100G line cards.

Can the 549AAHB002394ACGR be reprogrammed in-system, and what are the I²C timing requirements?

Yes, the 549AAHB002394ACGR supports full in-system frequency reprogramming via standard I²C interface at 100 kbps, 400 kbps, or 1 Mbps (Fast Mode Plus). SDA/SCL require external 2.2 kΩ pull-ups to VDD; setup/hold times meet SMBus v2.0 spec. Reprogramming a new frequency takes ≤100 µs for small changes (<±950 ppm) or ≤40 ms for large jumps, including internal VCO recalibration. The 549AAHB002394ACGR remains fully functional during updates with glitchless output transition.

What is the thermal performance of the 549AAHB002394ACGR in a 3.2×5 mm CLCC package, and how should it be mounted?

The 549AAHB002394ACGR in its 3.2×5 mm CLCC package has ΘJA = 55 °C/W (still air), ΨJB = 20 °C/W, and max junction temperature of 125 °C. For optimal thermal performance, mount using standard reflow profile (JEDEC J-STD-020, peak 260 °C for 20–40 sec), ensure ≥4 thermal vias under the exposed pad (if applicable), and avoid placing heat-generating components within 3 mm. The 549AAHB002394ACGR maintains ±20 ppm stability up to +85 °C ambient with proper PCB copper pour.